I've had this dilemma a lot on here with a few of my uploads.
You have a colour picture of a church, etc. It isn't really a landscape, hardly still life. Architecture? hmmm.
What do you do?
I've had that problem a few times. I guess I just choose a best fit. Most recently I shot the inside of an abandoned train. Where would that go? I think I chose Street. They should add categories for Urbex and HDR.